Rotary disk bit



May 15, 1928. 1,670,092

w. c. BAILEY ROTARY DISK BIT Filed May '2, 1 927 2 Sheets-Sheet 1 14 4 7257? A/LEY Patented May 15,1928.

UNITED STATES PATENT OFFICE.

WALTER O. BAILEY, O!

NOB-WALK, CALIFORNIA.

ROTARY DISK BIT.

Application fled Kay 7,

' of a rotary located on the floor of the derrick. The drillipe is supported by means of a travellinglock, this travelling-block being connected to a swivel at the upper end of the drill-pipe. Rotary mud is supplied to the drill or bit by means of a pressure-pump which is connected to the swivel by means of a stand-pipe and a flexible hose. The rotary mud passes from the bit upward through the well to the surface of the und, carrylng cuttings of the bit therewith. Diskbits are commonly employed as the cutter and ordinarily consist of a body and a plurality of rotatable disks, these disks being Elf-set to each side of a horizontal axis of'the It is an object of my invention to provide an improved disk-bit.

Another object of the invention is toprovide a disk-bit in which the disks are retained in oil-set position by a very rigid means.

A still further object of the invention is to provide a disk-bit in which the disks are ofi-set but are supported by a single shaft.

Another object of the invention is to provide a disk-bit havin a novel means for securing the shaft to e bod In my invention the disk-bit has a shaft which is supplorted on a diametral plane b a pair 0 gpof the body ofthe bit. Chrried by the s ft are eccentric bushings on which the cutters are carried.

It is one of the objects of this invention to provide a disk-bit of the character specified in which the bushings are secured to the y. Further objects and advantages of the invention will be made evident in the followingzdescription.

eferring to the accom anymg drawings in which my invention is i ustrated,

Fig. 1 is a diagrammatic view illustrating the utility of the invention.

Fig. 2 1s a vertical section through the invention.

Fig. 3 is a cross section taken on the line 8-3 of Fig. 2.

Fig. 18 a fragmentary section of the 1937. Serial Io. 189,588.

.lower part of the bit this section being taken at right angles to Fig. 2.

Fig. 5 is a fra mentary section taken on the line 5-5 of li ig. 4.

Fig. 6 is a fragmentary perspective view of one of the legs of the invention.

Fig. 7 is a perspective view of one of the bushings of the invention.

Fi 8 is a fragmentaig'view partly sectionei of an alternative orm of the invention.

Fig. 9 of Fig. 8.

Referring to Fig. 1, 11 represents a well which is being sunk by means of a disk-bit 12 embod ing the device of this invention.

The diskit 12 is secured to the lower end of a drill-pi 13 which is extended into the well from t e surface of the ground. The

drill-pipe 13 is supported by means of a travelling-block. 14 which is connected to a swivel 15 located at the upper end of the drill-pipe. The drill-pipe 13 and the diskbit 12 are rotated by a rotary 17 which is supported on the floor of a derrick 18. R0- tary mud is en lied through thedrill-pipe 13 and the dis it 12 by means of a pressure-pum 19 connected to the swivel 15 by means 0 a stand-pipe 20 and a flexible hose 21.

The details'of a preferred form of the in vention are shown best inFigs. 2 to 7 inelusive. The numeral represents a body having a pin 26st the upper end, b means of which t e disk-bit is attached to t e lower end of the drill-pipe. The body 25 headspending legs 27 which form a central s ace 28 at the lower end of the body. As i us trated best in Fig. 8, the depending legs 27 are formed symmetric on a horizontal axis A-A which extends in a diametral plane. Formed in each of the legs 27 is an opening 29 which isconcentric with the line A--A. Extending through these openings 29 and through the splace 28is a shaft 30, this shaft 30 being on't e axis A-A.

The shaft 30 is locked tothedependin legs 27 of the body 25 by means illustrate best in Fi 3,4 and 5. The outer faces of the legs are provided with vertical dovetailed grooves which are formed centrally on a vertical A--A. The ower ends of the dove-tailed grooves 32 are opened at the lower ends of -the de ending legs 27, and the up or ends thereo terminate a distance above be shaft is a section taken on the line 9-9 lane which intersects the line i 1 is in p ace,

sition with respect to a space between the .100 -meniber's move into of the bushing 30. The ends of the shaft are provided with dove-tailed recesses 33. Resting in the dove-tailed grooves 32 above the shaft 30 and extending into the dove-tailed recesses 33 are lock-members 34. The lock-members by key-p secured in place by fiat-head machine screws 36.. The=lock-members 34, before the shaft 30 is installed, are moved into an. extreme upper position in the dove-tailed grooves 32, 3

as indicated by dotted lines 38 in Fig. 4, the key-plates not being in place at this time. The shaft 30 is then installed in placeand the lock-members are lowered into looking position as shown by full lines in the drawm At this time the lower ends of the the dove-tailed recesses 33, thus securing the shaft 30 in place. The key-plates 35 are then secured in the upper ends of the dove-tailed grooves 32, thus preventing the lock-members from-sliding alon the dove-tailed grooves 32. Carrie by the shaft 30 in the space. 28

are bushings 40. Each bushing 40 is con-- structed as shown inFig. 7. The numeral '41 represents a cylindrical bearing portion on an axis B-B. At one end of the cylindrical bearing porti n 41 is an annular and radial flange 41. Formed through the bushing 40 is anopening 42 which is paralbushin The opening 42, when the bushin is concentric with the line A-- of the disk-bit. As illustrated in Fig. 6, each depending 1e 27 is provided with a counterbore 44. ecounterbores 44arejeccentric with respect to the line A--A a horizontal plane, off-set on one side of the line A-----Awhere\ as 'the other counterbore 44: lS 0fi-S6l5 on the other side of the line A --A..- As shown in Figs. 3 and 4, the ends of the bushings 40 project into the eccentric counterbores 44. t will be seen that in this manner the co centric bushings are locked in a certain p0 the body 25. There is inner ends of. the bushm 44 and in this space is a spacer 46 adapted to hold the bushings in thepositions shown. It will be seen that it is neces sary to have a space between the bushin so that they can e moved upward into a space 28 and. then outward so that the ends is ereof rest in the oounterbores 44. With reference to Fig. 3, it will be seen that the center lines B --B of the bushings 40 are oil-set m a horizontal plane on opposite sides of the line A- A.

Carried by the pendin The spacer 46 is; then bushings 40 and the which is formed concentric 57 and outer (thereof. The 'outer" branches 58 have lubri- '50 may be su lel to the axis B-B but is eccentric to the and one .countcr'bore 44 ,is'

hearing of thenew,

bushings 40 are cutters in the form, of disks 50. The disks are retained in. place by the annular flanges 4]." and .are' separated from engagement with inner faces of the delegs 27 by I wear' plates 51. As shown 1n the drawings, the disks 50 are in off-set relation in 1; es parallel to the line A- A but-are paralleliniglanes at right angles'to the line A- -AL; e disks; 50 rotate on center lines indicated by the lines B-B in Fig.3. It will be, seen that in this man-: ner thedisks engage the wall of th'ejwell 11 on opposite sides according to. common prac- 'In'assembling the parts the disk-bit, the disks 50 and the wear-plates 51' are first installed on the bushings 40 and then the.

bushingsell are moved into the opening 28 and then moved outward so that the ends thereof rest in the eccentric counterbores v placed between the adjacent ends of the shaftBO, is extended through the aligned openings'of these parts-of the bit. It should of coursebe understood that. the lock members 34 have first been installed as previously explained. @The lock-members-are'then secured inlocking position and the bit is ready'for use. 1

Lubricati'n is" supplied to the bit through a lubricating duct 56 havinga central branch branches 58 at, the lower ends eating tubes 59 extending downward therefrom so that the leading edges of the disks plied with rotary mud.

From the oregoing description it will be seen that the assembly for vsupporting the disks 50in ofi-set positions is quite rigid; A

the reason being, first. that the bushings 40 are supported by a unitary member, namely,

the shaft 30, and, second, the bushings 40 are extended into the: eccentric c'ounterbores' {l4 so that a rigidlocking between the bushingsfand the body is, procured. In'the greferred form of my invention as illustrate in Figs. '2 to 7 inclusive, the lockmembers 34 are provided withreaminglele ments 60 which are formed integrally't erewith. These reaming elements 60 are ada ted to true being drille In Figs. 8 and 9 I show an alternative form of the invention in which the reaming elements 60 are omitted. In Figs. .8 and 9 similar parts are designated by the same numerals that these numerals designate in the other figures of the drawings.

I claim as my invention: I

1; A rotary hit for drilling wells comprismg ,.;a' body having a pair of depending spayedv legs, there being formed in said legs and disali bores'on the inner faces of sai legs; a

throng up any unevenness as the wel is Y aligned openings ed eountersaid 1 1n Sillfl ingly eccentric to said shaft and each one extei'a'ling into one of said counterbores: means for retaining said shaft in place; and cutters carried by said bushings.

2. A combination as defined in claim 1 also including a spacer adapted to be located between adjacent ends of said bushings.

3. A combination as defined in claim 1 in which said oounterbores are eccentric to said aligned openings in a horizontal plane, said counter-bores being oft-seton opposite sides of the axis of said shaft.

4. A combination as defined in claim 1 in which said means for retaining said shaft in place comprises a receiving groove formed in one of said depending legs. a recess formed at one end of said shaft. and locking means adapted to fit in said receiving groove and said recess.

5. A combination as defined in claim 1 in which said means for retaining said shell in place comprises a receiving groove formed in one of said depending legs. a recess formed at one end of said shalt. locking means adapted to lit in said receiving groove and said recess, and a key member positioned in said receiving groove above said .ock member to prevent said lock member from moving upward out of a position in which it extends into said recess.

6. A combination as defined in claim 1 in which said means for retaining said shaft in place comprises a receiving groove formed in one of said depending legs, a recess formed at one end of said shaft, and locking means adapted to fit in said receiving groove and said recess, and in which a eutter is provided on said locking means.

7. A rotary bit for drilling wells comprisin a body having a pair of depending s, ed legs, there being aligned openings formed in said legs and disaligned counterbores on the inner faces of said legs; a shaft extending into said openings and through said space; bushings carried on said shaft in said space, said bushings being opposingly eccentric to said shaft and each one extending into one of said counterbores; cutters, one of said cutters being carried by each of said bushings: a spacer carried on said shaft between said bushings, said spacer being adapted to hold said bushings in said disaligned counterbores; and lock means, said lock means being adapted to rest in a receiving groove of one of said legs and to extend into a recess formed in one end of said shaft.

8. A combination as defined in claim 7 in which said receiving groove is vertical and connects to the lower end of said depending leg in which it is formed, and in ,-ombination with a key member adapted to fit in the upper end of said receiving groove above said lock-member so as to retain said lock-member in a position to extend into Said recess.

9. A combination as defined in claim 1 in which said shaft retaining means is formed to provide a reaming cutter.

10. A rotary bit for drilling wells comprising: a drill bit body adapted to support a pair of cutters, there being a pair of pockets formed in said body on opposite sides of the axis thereof, said pockets being disaligned with each other, and a hole in said body which is disaligned with each of said pockets; cutter bushings adapted to fit into said pockets, there being openings in said bushings adapted to be aligned with said hole in said body; cutters adapted to rotate upon said bushings; and a locking pin adapted to extend into said body hole and into the openings in said bushings.

In testimon whereof, I have hereunto set my hand at ilos Ange'les, California, this 2nd day of May, 1927.

WALTER C. BAILEY. 

